What I called "legitimate" is not subjective. It corresponds to the
objectives of the Tor network. That is why I added "i.e., the uses promoted
by people actively working for Tor". Just read the home page of the Tor
project, section "What is Tor":
Tor is free software and an open network that helps you defend against a form
of network surveillance that threatens personal freedom and privacy,
confidential business activities and relationships, and state security known
as traffic analysis.
If, in this text, you read "let American people enjoy BBC videos", then you
cannot read.
You are confirming that you are perfectly aware of the main problem the Tor
project faces to fulfill its objectives: the workload increasing faster than
the number of exit nodes. Anyway you are selfish enough to:
not have any moral issue overloading the network by streaming BBC videos
(hence taking the bandwidth that is aimed at fulfilling Tor's goal);
arguing against anybody managing an additional exit node because you believe
the objectives of the Tor project are not worth the risk.
I repeat: how isn't that parasitizing?